Can someone tell me where I can find a how to, or tell me how to do it, or if someone has one they want to sell. My car is strapped up on the Dyno right now and i need to do this mod before we can finish tuning it

. My car starts going lean at 6k and we're only running 14lbs. I have 550's and a 255, so there is plenty of fuel. I need to fix this ASAP.
Thanks.